11 Fancy Goldfish

Total Page:16

File Type:pdf, Size:1020Kb

11 Fancy Goldfish Checklist Never release your aquarium How to care for... Before purchase make sure that: animals or plants into the wild Never release an animal or plant bought for a home aquarium into the wild. It is illegal and for most fish species 1 You have the appropriate equipment and position for the aquarium. this will lead to an untimely and possibly lingering death because they are not native to this country. Any animals or You have researched all the species you are interested plants that do survive might be harmful to the environment. Fancy 2 in and your final choices are all compatible. You are familiar with how to transport and release Important things to remember 3 Always buy... your fish. test kits and regularly check the water for ammonia, nitrite, goldfish nitrate and pH. This will allow you to make sure the water in You are aware of the daily, weekly and monthly 4 your aquarium is not causing welfare problems for your fish. maintenance your aquarium will require. Establish a routine... 5 You are prepared to look after your fish properly for for testing the water in your aquarium. Record your results the duration of their life. to enable you to highlight fluctuations quickly. Also check 11 Coldwater fish the temperature of the water. Equipment Maintain... 1 Glass or plastic aquarium the water in the aquarium within the accepted parameters highlighted in this leaflet. You may need to do regular water Gravel cleaner changes to achieve this. 2 3 Water testing kit Always wash your hands... 4 Tap water conditioner making sure to rinse off all soap residues, before putting them into your aquarium. Wash your hands again afterwards 5 Gravel or other suitable substrate and certainly before eating, drinking or smoking. 6 Filter 7 Food—ensure variety Never siphon by mouth... A fish tank can harbour bacteria which can be harmful if Before purchase make sure: swallowed. Buy a specially designed aquarium gravel cleaner which can be started without the need to place the siphon in your mouth. 1 The aquarium is of a suitable size 2 Water parameters are as advised in this leaflet. Scan this code to If in doubt contact download an your OATA electronic copy retail member for further information Photo courtesy of A Valovec May 2013 © Copyright OATA Ltd 2010 Introduction Aquarium requirements Feeding Fancy goldfish like Orandas, Black Moors and Ryukins are all While fancy goldfish can be kept in a small aquarium when they are Like common goldfish, fancy goldfish are opportunistic feeders the same species of fish as common goldfish, Carassius auratus. young, be prepared to get a larger aquarium as they grow. A larger and appear to have insatiable appetites. Over-feeding can be All of these varieties are the result of centuries of careful aquarium has the extra benefit of allowing you to keep more fish avoided by feeding once or twice a day with what they can eat selective breeding to emphasise certain traits. and allows for more stable water quality. Whatever the size of in no more than a minute or so. Excess food should always be aquarium, a filter must always be used. All the fancy breeds prefer a removed immediately to avoid polluting the water. Fancy goldfish are more delicate than common goldfish and gentle current, so make sure that the filter’s output is not too require greater care to keep them successfully. To achieve this, powerful, or is evenly distributed throughout the aquaria by use of A goldfish flake or pellet food can be used as a staple diet, but they are best kept in indoor aquaria only. As with all fish, a spray bar if possible. add variety by providing a selection live or frozen foods such as maintaining good water quality is essential for their health, but daphnia, bloodworm or brine shrimp. Vegetable matter can be also make sure their habitat, diet and companions are Aquarium gravel or other suitable substrate should be used to cover provided in the form of aquatic plants, blanched lettuce or compatible with their needs. the bottom of the aquarium and will help to anchor plants and thawed and shelled frozen peas. A good and varied diet can ornaments in place. When buying gravel, speak to your retailer to prevent associated buoyancy problems, and will also promote a ensure that you buy the correct size to avoid the goldfish strong and healthy immune system to fight off infectious Water requirements accidentally ingesting it. If you want to decorate the aquarium with diseases. Fancy goldfish are intolerant of poor water conditions. It is artificial plants, add some live aquatic plants too. Plants and algae recommended the water parameters stay within the following can play an important part in fancy goldfish nutrition which is a key guidelines although they can acclimatise to a wider range of to keeping them healthy. Common problems temperature, pH and hardness over a period: Water quality problems will affect fish behaviour and can be Temperature: between 4-25°C, ideally between 15-23°C (the All ornaments, including artificial plants, should be chosen carefully. shown by clamped fins, reduced feeding, erratic swimming and aquarium should be kept away from heat and draughts to Avoid those with sharp or very rough surfaces so as to prevent gasping at the surface. Immediately test the water if any of these reduce fluctuations) injuring breeds that have protruding eyes such as Celestials, symptoms are shown. pH: 6.0-8.0 Telescope-eyed breeds. Ammonia: 0mg/l (0.02mg/l may be tolerated for short periods) Good water quality and a healthy, varied diet can help prevent Nitrite: 0mg/l (0.2mg/l may be tolerated for short periods) A heater is not required for fancy goldfish unless they are kept in a many diseases in goldfish such as fungal or bacterial infections Hardness: moderately soft - hard (5-19°dH) very cold room. Although goldfish are coldwater fish, they do not and swim bladder problems. tolerate rapid fluctuations in their water temperature as these can cause stress leading to disease. Keep the aquarium out of draughts In hooded breeds, such as Lionheads, Orandas and Ranchus Biology and away from sources of excess heat. small, white, fluffy patches within the creases of the hood are The fundamental characteristics of fancy goldfish and common sometimes seen. Normally, this is just sloughed material and goldfish are actually very similar. Many of the fancy goldfish mucus and should fade with time. However, reddened or have a squatter appearance and do not get as large as common Maintenance extensive areas of these patches that persist might require goldfish, usually growing no larger than 20 cms. Their lifespan At least once every two weeks, a partial water change of 25-30% is treatment. If in doubt, ask your retailer for further advice. is approximately 6 to 8 years, but some have been recorded to strongly recommended (a gravel cleaner is useful to remove waste live for 20 years. from the gravel). The water should be tested regularly to ensure pollutants such as ammonia and nitrites don’t build up. Ensure you treat all replacement water with tap water conditioner or allow the Compatibility The position and shape of their swim bladder is different from All varieties of fancy goldfish will normally live together happily. that of a common goldfish. This on its own causes no replacement water to stand or aerate it to remove any chlorine present before adding it to the aquarium. If you wish to add any other species, ask advice from your problems, but an improper diet can lead to buoyancy problems retailer. by preventing the swim bladder from functioning correctly. Filters should be checked for clogging and blockages. If the filter It is not advisable to keep fancy varieties with Shubunkins, One feature that fancy goldfish retain from their common needs cleaning, then do not run it under the tap as any chlorine present may kill the beneficial bacterial population that has comet or common goldfish. More often than not, the breeds goldfish ancestry is tubercles. These are small white pimples can out-compete the fancy goldfish for food. In some cases that develop on the gill covers of males as they approach breed- established in the media. Instead, it can be rinsed in the tank water which is removed during a partial water change as this reduces the there are reports of boisterous comets fin nipping the slower ing condition, and should not be confused with the white spot swimming fancy varieties. parasite which appears all over the body. amount of bacteria which are lost. Good husbandry is essential as these fish can be stressed by even the smallest amounts of ammonia and nitrite. Test the water to Breeding monitor the ammonia, nitrite and nitrate levels every week, Fancy goldfish can be bred in captivity. They are egg scatterers especially during initial set-up and after adding extra fish. and the eggs must be removed from the aquarium to avoid predation. The eggs normally hatch after about 3 days, but this is also depends on temperature. .
Recommended publications
  • Goldfish Morphology As a Model for Evolutionary Developmental Biology
    Overview Goldfish morphology as a model for evolutionary developmental biology Kinya G. Ota* and Gembu Abe Morphological variation of the goldfish is known to have been established by artificial selection for ornamental purposes during the domestication process. Chinese texts that date to the Song dynasty contain descriptions of goldfish breeding for ornamental purposes, indicating that the practice originated over one thousand years ago. Such a well-documented goldfish breeding process, combined with the phylogenetic and embryological proximities of this species with zebrafish, would appear to make the morphologically diverse goldfish strains suitable models for evolutionary developmental (evodevo) studies. How- ever, few modern evodevo studies of goldfish have been conducted. In this review, we provide an overview of the historical background of goldfish breed- ing, and the differences between this teleost and zebrafish from an evolutionary perspective. We also summarize recent progress in the field of molecular devel- opmental genetics, with a particular focus on the twin-tail goldfish morphology. Furthermore, we discuss unanswered questions relating to the evolution of the genome, developmental robustness, and morphologies in the goldfish lineage, with the goal of blazing a path toward an evodevo study paradigm using this tel- eost species as a new model species. © 2016 The Authors. WIREs Developmental Biology pub- lished by Wiley Periodicals, Inc. How to cite this article: WIREs Dev Biol 2016, 5:272–295. doi: 10.1002/wdev.224 INTRODUCTION processes of goldfish strains have been documented by authors in many different countries using different fi – he gold sh (Carassius auratus) is a well-known, languages.1 9 Of these reports, the descriptions by Tornamental, domesticated teleost species, which Smartt2 are the most up-to-date and cover the widest consists of a number of morphologically divergent range of the literature.
    [Show full text]
  • Spawning and Early Life History of Mountain Whitefish in The
    SPAWNING AND EARLY LIFE HISTORY OF MOUNTAIN WHITEFISH IN THE MADISON RIVER, MONTANA by Jan Katherine Boyer A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Fish and Wildlife Management MONTANA STATE UNIVERSITY Bozeman, Montana January 2016 © COPYRIGHT by Jan Katherine Boyer 2016 All Rights Reserved ii ACKNOWLEDGMENTS First, I thank my advisor, Dr. Christopher Guy, for challenging me and providing advice throughout every stage of this project. I also thank my committee members, Dr. Molly Webb and Dr. Tom McMahon, for guidance and suggestions which greatly improved this research. My field technicians Jordan Rowe, Greg Hill, and Patrick Luckenbill worked hard through fair weather and snowstorms to help me collect the data presented here. I also thank Travis Horton, Pat Clancey, Travis Lohrenz, Tim Weiss, Kevin Hughes, Rick Smaniatto, and Nick Pederson of Montana Fish, Wildlife and Parks for field assistance and advice. Mariah Talbott, Leif Halvorson, and Eli Cureton of the U. S. Fish and Wildlife Service assisted with field and lab work. Richard Lessner and Dave Brickner at the Madison River Foundation helped to secure funding for this project and conduct outreach in the Madison Valley. The Channels Ranch, Valley Garden Ranch, Sun West Ranch, and Galloup’s Slide Inn provided crucial land and river access. I also thank my fellow graduate students both for advice on project and class work and for being excellent people to spend time with. Ann Marie Reinhold, Mariah Mayfield, David Ritter, and Peter Brown were especially helpful during the early stages of this project.
    [Show full text]
  • Fisheries Management Plan for Black Hills Streams 2015 – 2019
    Fisheries Management Plan for Black Hills Streams 2015 – 2019 South Dakota Game, Fish and Parks Wildlife Division Gene Galinat Greg Simpson Bill Miller Jake Davis Michelle Bucholz John Carreiro Dylan Jones Stan Michals Fisheries Management Plan for Black Hills Streams, 2015-2019 Table of Contents I. Introduction ............................................................................................................................... 3 II. Resource Descriptions ........................................................................................................... 4 Black Hills Fish Management Area ...................................................................................... 4 III. Management of Black Hills Fish Management Area Stream Fisheries ...................... 7 Classification of Trout Streams ............................................................................................. 7 Regulations .............................................................................................................................. 7 Stocking .................................................................................................................................... 8 Fish Surveys ............................................................................................................................ 8 Angler Surveys ........................................................................................................................ 9 Habitat and Angler Access ...................................................................................................
    [Show full text]
  • Transparency and Mottling, a Case of Mendelian Inheritance in the Goldfish Carassius a Uratus” Shisan C
    TRANSPARENCY AND MOTTLING, A CASE OF MENDELIAN INHERITANCE IN THE GOLDFISH CARASSIUS A URATUS” SHISAN C. CHES Biologic01 Laboratory, the Scieiice Society of China, Nanking, China TABLE OF CONTENTS PAGE IVrRODUCTION. 434 Material and methods 435 Yarrative of the experiments 436 Terminology and symbols 439 Data of breeding experiment4 440 The manifold effects. 445 \Thy transparent fish are rare 446 Somatic mutations, 447 Review of literature and comparison with other cases 449 SI~AEKARY.. 450 IJTTFRAT~XECITl I) .. 4 50 INTRODUCTION In the spring of 1924 I made a preliminary study of the heredity of goldfish by crossing various breeds of goldfish and mating domesticated breeds of goldfish with the wild goldfish. During the progress of this preliminary study I noticed that the inheritance of one of the characters under investigation was rather simple. This character was called “transparent scale” in my previous paper (CHEN1925). The goldfishes of this breed have only a few normal scales, the remainder of the body being apparently naked. The apparently naked part of the body is really covered by scales which, on account of the lack of a layer of reflecting tissue on their inner side, are as trans- parent as glass. This breed of goldfish is called LLshubunkin’’in Japan (MATRUBAKA1908) and is known as “calico” in the United States (INNES1917). Beginning in the spring of 1925 I started more extensive experiments to investigate the mode of inheritance of this character, “transparent sca1e”or “calico.” In the summer of 1925 I obtained enough evidence to prove that the inheritance of this character is Mendelian.
    [Show full text]
  • The Vermont Management Plan for Brook, Brown and Rainbow Trout Vermont Fish and Wildlife Department January 2018
    The Vermont Management Plan for Brook, Brown and Rainbow Trout Vermont Fish and Wildlife Department January 2018 Prepared by: Rich Kirn, Fisheries Program Manager Reviewed by: Brian Chipman, Will Eldridge, Jud Kratzer, Bret Ladago, Chet MacKenzie, Adam Miller, Pete McHugh, Lee Simard, Monty Walker, Lael Will ACKNOWLEDGMENT: This project was made possible by fishing license sales and matching Dingell- Johnson/Wallop-Breaux funds available through the Federal Sportfish Restoration Act. Table of Contents I. Introduction ......................................................................................... 1 II. Life History and Ecology ................................................................... 2 III. Management History ......................................................................... 7 IV. Status of Existing Fisheries ............................................................. 13 V. Management of Trout Habitat .......................................................... 17 VI. Management of Wild Trout............................................................. 34 VII. Management of Cultured Trout ..................................................... 37 VIII. Management of Angler Harvest ................................................... 66 IX. Trout Management Plan Goals, Objectives and Strategies .............. 82 X. Summary of Laws and Regulations .................................................. 87 XI. Literature Cited ............................................................................... 92 I. Introduction
    [Show full text]
  • 321 Cmr: Division of Fisheries and Wildlife
    321 CMR: DIVISION OF FISHERIES AND WILDLIFE 321 CMR 5.00: COLDWATER FISH RESOURCES Section 5.01: Introduction and Purpose 5.02: Definitions 5.03: Criteria and Procedure for Designating Coldwater Fish Resources 5.04: Requests that the Division Evaluate the CFR Status of a Waterbody 5.01: Introduction and Purpose Certain species of fish are sensitive to increases in temperature and require coldwater to fulfill one or more of their life stage requirements. Since the 1940's, the Division has documented the presence of coldwater fish resources (CFRs) in the Commonwealth where these fish occur. In the 1990's, the Division established a list of CFRs to facilitate the tracking and effective monitoring, management and protection of these resources by the Division, other state agencies, and local regulatory authorities, including conservation commissions and planning boards. Under the Department of Environmental Protection's Water Management Act regulations at 310 CMR 36.00: Massachusetts Water Resources Management Program, an applicant proposing a water withdrawal that may affect a CFR designated by the Division pursuant to 321 CMR 5.00 will be required to minimize any impact on the CFR. The Division has not assessed all of the waterbodies in the Commonwealth to determine their status as a CFR. 321 CMR 5.00 codifies the criteria, procedures and related definitions used by the Division to designate waterbodies as CFRs. 321 CMR 5.00 also provides notice of where the Division's current list of CFRs is available for review by regulatory authorities
    [Show full text]
  • Polyphyletic Origin of Ornamental Goldfish
    Food and Nutrition Sciences, 2015, 6, 1005-1013 Published Online August 2015 in SciRes. http://www.scirp.org/journal/fns http://dx.doi.org/10.4236/fns.2015.611104 Polyphyletic Origin of Ornamental Goldfish Aleksandr V. Podlesnykh1, Vladimir A. Brykov1,2, Lubov A. Skurikhina1 1Far Eastern Branch of the Russian Academy of Sciences, A. V. Zhirmunsky Institute of Marine Biology, Vladivostok, Russia 2School of Natural Sciences, Far Eastern Federal University, Vladivostok, Russia Email: [email protected] Received 6 May 2015; accepted 17 August 2015; published 20 August 2015 Copyright © 2015 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract Mitochondrial DNA fragment of cytb was compared in all species Carassius auratus complex and three forms of ornamental goldfish. It is shown that the phylogenetic relationships between com- plex species correspond to the existing views, based on mtDNA data and geographical distribution. All forms of ornamental goldfish have a monophyletic origin from Chinese goldfish C. auratus au- ratus. The analysis showed that three nuclear genes (rps7, GH1 and Rh) in the two forms of orna- mental goldfish (Oriental twintail goldfish and Chinese Ranchu) were almost identical C. auratus auratus genes, while all three gene in another more simple form of goldfish (common goldfish) were highly homologous to carp Cyprinus carpio nuclear genes. The obtained data suggested that in the history of aquarium goldfish breeding occurred the stage of distant hybridization between goldfish and common carp. Subsequently, the nuclear genomes of some ornamental forms could be enriched by goldfish genes (a relatively recent form as Oriental twintail goldfish and Chinese Ranchu) or common carp genes (the simplest and most ancient forms like common goldfish) as a result of multidirectional breeding and selection of aquarium goldfish various forms.
    [Show full text]
  • Goldfish Care Sheet
    Goldfish Care Sheet brought in during winter in harsh climates. In aquariums, adult common Often Overlooked goldfish, comets and shubunkins should have at least 20 gallons of One of the most common fish in the aquarium hobby, goldfish belong water per fish, while adult fancy goldfish should have at least 10 gallons to the Family Cyprinidae and are native to eastern Asia. They are related per adult fish. The filter should be slightly over-sized to accommodate to – but not the same as – carp, and were first domesticated from food high waste production and additional aeration is recommended at fish in China over 1,000 years ago. Goldfish can be distinguished from warmer temperatures. Larger goldfish will eat most live plants with the koi and common carp by the absence of barbels or “whiskers” in the possible exception of Cryptocorynes, Java fern and Anubias, although corners of their mouth. Through selective breeding, many “fancy” they may uproot even these. Avoid decorations with sharp edges and goldfish strains sporting different body shapes, colors and fin types are abrasive rocks such as lava and tufa, which may tear delicate fins as well available today. They include comets, shubunkins, fantails, orandas, as eye sacs on bubble eyes, celestial eyes, moors and telescopes. Goldfish ryukins, moors, telescope eyes, celestial eyes, bubble eyes, butterfly tails, like to forage in the substrate, so avoid jagged or crushed glass gravel. pearlscales, wakins, lionheads, ranchus and many more. Orandas, Provide adequate water flow, but avoid strong currents. lionheads and ranchus develop a crown of fatty tissue, called hood growth, over their heads that in mature fish may completely cover their Behavior/Compatibility eyes! Fancy goldfish can become stunningly beautiful and command extremely high prices.
    [Show full text]
  • Carps, Minnows Etc. the Cyprinidae Is One of the Largest Fish Families With
    SOF text final l/out 12/12/02 12:16 PM Page 60 4.2.2 Family Cyprinidae: Carps, Minnows etc. The Cyprinidae is one of the largest fish families with more than 1700 species world-wide. There are no native cyprinids in Australia. A number of cyprinids have been widely introduced to other parts of the world with four species in four genera which have been introduced to Australia. There are two species found in the ACT and surrounding area, Carp and Goldfish. Common Name: Goldfish Scientific Name: Carassius auratus Linnaeus 1758 Other Common Names: Common Carp, Crucian Carp, Prussian Carp, Other Scientific Names: None Usual wild colour. Photo: N. Armstrong Biology and Habitat Goldfish are usually associated with warm, slow-flowing lowland rivers or lakes. They are often found in association with aquatic vegetation. Goldfish spawn during summer with fish maturing at 100–150 mm length. Eggs are laid amongst aquatic plants and hatch in about one week. The diet includes small crustaceans, aquatic insect larvae, plant material and detritus. Goldfish in the Canberra region are often heavily infected with the parasitic copepod Lernaea sp. A consignment of Goldfish from Japan to Victoria is believed to be responsible for introducing to Australia the disease ‘Goldfish ulcer’, which also affects salmonid species such as trout. Apart from the introduction of this disease, the species is generally regarded as a ‘benign’ introduction to Australia, with little or no adverse impacts documented. 60 Fish in the Upper Murrumbidgee Catchment: A Review of Current Knowledge SOF text final l/out 12/12/02 12:16 PM Page 61 Distribution, Abundance and Evidence of Change Goldfish are native to eastern Asia and were first introduced into Australia in the 1860s when it was imported as an ornamental fish.
    [Show full text]
  • Caring for Your Goldfish
    Adding a Goldfish to a Cleaning Your Fish Bowl Dirty fish bowls not only look bad, they Bowl or Aquarium Caring for Now it’s time to put your new Goldfish in are also unhealthy for fish. By following a their new home! Whenever fish are netted few simple maintenance steps your fish Your and handled, their protective slime coat is bowl will always look beautiful. The following steps are an ideal regiment for rubbed off. When adding fish to any keeping your fish bowl looking great. Goldfish aquarium, be sure to add additional water conditioner to help relieve stress. The best To keep your fish healthy, you should method to add new fish is to float the unopened bag of fish in their new home change at least half of the water in your for 10 minutes to allow the fish to adjust Goldfish bowl or aquarium every 3 days. Follow these easy steps: to the water temperature. Then, open the bag and gently release the fish into their 1. Fill a separate container with tap water. Mix hot and cold tap water new home. The bag water may contain fish waste (ammonia), so try to avoid until it is the same temperature as adding the bag water to the aquarium. the water your Goldfish is swimming in. 2. Add a water conditioner to the tap water to remove the disinfectants Feeding Your Fish that are toxic to your fish. It is best to feed your Goldfish only 3. Add the aquarium salts and test the enough food that it can eat in five pH level, adjusting the pH level as minutes.
    [Show full text]
  • TOP-VIEW GOLDFISH: the OTHER PERSPECTIVE Steve Hopkins
    TOP-VIEW GOLDFISH: THE OTHER PERSPECTIVE Steve Hopkins By some accounts, there are over three hundred varieties of goldfish. These can be grouped in various ways such as by tail type, presence or absence of head growth, presence or absence of dorsal fin, eye shape, etc. They can also be grouped based on a whether they were bred and selected to be viewed from the top or viewed from the side. Originally, all goldfish were kept in shallow ponds, ceramic bowls or other containers and viewed from the top. Considering the thousand-year history of goldfish keeping, the glass aquarium is a relatively new innovation which did not come into use until about 150 years ago. However, being able to easily view goldfish from the side through glass has undoubtedly influenced what characteristics are selected for and impacted the development of new varieties. Today, the goldfish hobbyists are a diverse group. While most goldfish are destined for the home aquarium and represent an indoor diversion, goldfish ponds, tubs and goldfish in the water garden continue to increase in popularity. When choosing a goldfish, it is important to consider how it will be viewed and select a variety which is appropriate for the setting in which it will be displayed. In selecting a top-view goldfish, remember that they are typically seen against a dark background. It does not matter what color your tub or pond was when it was new, over time the surfaces will become covered with algae and other growth and appear dark green to black. Without doubt, red and white metallic-scale goldfish provide the contrast to display best against a dark background.
    [Show full text]
  • The Fish Communities of the Toronto Waterfront: Summary and Assessment 1989 - 2005
    THE FISH COMMUNITIES OF THE TORONTO WATERFRONT: SUMMARY AND ASSESSMENT 1989 - 2005 SEPTEMBER 2008 ACKNOWLEDGMENTS The authors wish to thank the many technical staff, past and present, of the Toronto and Region Conservation Authority and Ministry of Natural Resources who diligently collected electrofishing data for the past 16 years. The completion of this report was aided by the Canada Ontario Agreement (COA). 1 Jason P. Dietrich, 1 Allison M. Hennyey, 1 Rick Portiss, 1 Gord MacPherson, 1 Kelly Montgomery and 2 Bruce J. Morrison 1 Toronto and Region Conservation Authority, 5 Shoreham Drive, Downsview, ON, M3N 1S4, Canada 2 Ontario Ministry of Natural Resources, Lake Ontario Fisheries Management Unit, Glenora Fisheries Station, Picton, ON, K0K 2T0, Canada © Toronto and Region Conservation 2008 ABSTRACT Fish community metrics collected for 16 years (1989 — 2005), using standardized electrofishing methods, throughout the greater Toronto region waterfront, were analyzed to ascertain the current state of the fish community with respect to past conditions. Results that continue to indicate a degraded or further degrading environment include an overall reduction in fish abundance, a high composition of benthivores, an increase in invasive species, an increase in generalist species biomass, yet a decrease in specialist species biomass, and a decrease in cool water Electrofishing in the Toronto Harbour thermal guild species biomass in embayments. Results that may indicate a change in a positive community health direction include no significant changes to species richness, a marked increase in diversity in embayments, a decline in non-native species in embayments and open coasts (despite the invasion of round goby), a recent increase in native species biomass, fluctuating native piscivore dynamics, increased walleye abundance, and a reduction in the proportion of degradation tolerant species.
    [Show full text]